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x=[2.55782,1.91774,1.61714,1.26626,0.83714,0.51302,0.2711,0.1319];

y=[0.29294,0.22826,0.1979,0.15722,0.11102,0.06962,0.03158,0.0125];

z=[0.285144,0.25686,0.226104,0.207432,0.1917,0.171792,0.148836,0.126948];

z=a1*a2*x/(1+a2*x+a3*y)+15*(a4*a3*y/(1+a2*x+a3*y));

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